collectd: fix license

- Since version 5.5, daemon is licensed under MIT:
  https://github.com/collectd/collectd/commit/889e5e6bd51d38d490289332053a238a4f1c70b3
- Plugins are licensed under MIT, GPL-2.0 or LGPL-2.1
- Add libltdl/COPYING.LIB to license files to have a copy of LGPL-2.1 as
  it is not in COPYING
- Add hash for both license files

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit d5fa317f2dc2317d5d2526c61a6f88af92cdfc73)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/collectd/collectd.hash

@@ -1,2 +1,6 @@
 # From https://collectd.org/files/SHA256SUM
 sha256	7edd3643c0842215553b2421d5456f4e9a8a58b07e216b40a7e8e91026d8e501	collectd-5.7.1.tar.bz2
+
+# Hash for license files
+sha256	ed0409b2b1c30566dab5fcdaf46ee70e140c99788e22f0267645a9357b476ae4	COPYING
+sha256	f18a0811fa0e220ccbc42f661545e77f0388631e209585ed582a1c693029c6aa	libltdl/COPYING.LIB

package/collectd/collectd.mk

@@ -9,8 +9,8 @@ COLLECTD_SITE = http://collectd.org/files
 COLLECTD_SOURCE = collectd-$(COLLECTD_VERSION).tar.bz2
 COLLECTD_CONF_ENV = ac_cv_lib_yajl_yajl_alloc=yes
 COLLECTD_INSTALL_STAGING = YES
-COLLECTD_LICENSE = GPL-2.0, LGPL-2.1
-COLLECTD_LICENSE_FILES = COPYING
+COLLECTD_LICENSE = MIT (daemon, plugins), GPL-2.0 (plugins), LGPL-2.1 (plugins)
+COLLECTD_LICENSE_FILES = COPYING libltdl/COPYING.LIB
 
 # These require unmet dependencies, are fringe, pointless or deprecated
 COLLECTD_PLUGINS_DISABLE = \